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The killer who brutally stabbed a marketing executive in his Lower Haight apartment earlier this month may have sliced his own hand.

Investigators returned to the crime scene Tuesday night to search for more clues in the mysterious murder of Philip DiMartino. The 36-year-old was found with multiple stab wounds Aug. 2 in his apartment at 138 Hermann St., police said.

A concerned co-worker visited the apartment that day after DiMartino failed to arrive at work. The co-worker saw the body through a window and called police.

Police have not said whether any witnesses have come forward with information on the case. However, investigators have released some clues. There was no forced entry into the apartment, and the killer may have been injured after cutting his hand during the attack, police spokesman Officer Albie Esparza said.

Police also said the suspect is a Hispanic man and the murder may have occurred Friday, July 30.

Police have been reaching out to the public for help in the case, particularly in the Castro district. DiMartino frequented bars in the area, police said.

His death has sparked interest from the “true crime” TV show “48 Hours Mystery,” which recently called police asking if there are any similarities in this crime to an internationally famous San Francisco case in 2007 that was featured on the show.

In that case, a 36-year-old man with dual French and American citizenship was found dead with three stab wounds inside his locked apartment. The case sparked controversy over whether the death was a suicide, as an SFPD investigation initially determined, or a killing, as French investigators ruled.

The family of the French-American, named Hugues de la Plaza, has contacted The Examiner saying they want to help in the investigation of DiMartino’s murder.